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Audio Circuits:  Power Amplifiers
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Audio Power Amplifiers:   #'s - A       B - E      F - L      M - R      S - Z

Last Updated: November 30, 2017 07:38 AM


Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

Basic Low frequency preamplifiers -  Schematic only __ Designed by Guy Roels ON6MU

Bass Guitar Amp -  I've been wanting to put these EL509's to use!!! Figured a nice high-power bass guitar amp would be a perfect application.  I have the amplifier built to the point shown in the schematic, above.  Initial testing with tone-stack replaced with a 10:1 voltage divider is very promising.  Still need to decide on the tone stack arrangement.  The unit is built as a stand-alone head, and will be used with a Peavey 15" + 2x 10" Bass cabinet __ Designed by Bob Danielak

Bidirectional 2.4 GHz One Watt Amplifier -  This will show you how to add a bi-directional, 2.4 GHz amplifier to your Proxim Symphony for under $100.  Bi-directional means you can mount the amplifier at the antenna to help overcome any cable loss, and the amplifier will automatically switch between receive and transmit modes.  The cost is reduced by using readily available materials and components. __ Green Bay Professional Packet Radio

Bridging Adapter for Audio Power Amplifiers -  A conventional adapter for bridging power amplifiers __ Designed by Rod Elliott  ESP

Build this Simple Circuit A/V wireless transmitter -  This circuit provides you with wireless audio and visual transmission to a TV.  The TV acts as a receiver, eliminating the need to buy a separate monitor.  You can also hook it up to a VCR or CCD Camera, and even set up a remote CCTV security system!Circuit design __ Contact: info @ wzmicro.com

Capacitance Multiplier Power Supply for Class-A Amplifiers -  A basic circuit is provided in the article, but it is assumed that the builder knows all the pitfalls.  The supplied schematic is in fact for a capacitance multiplier filter   (not a regulator) , but is somewhat lacking   (I feel) and can be improved dramatically __ Designed by Rod Elliott  ESP

Car PreAmplifier & Artificial Earth -  Especially for car audio installations, can be used for any single supply system __ Designed by Rod Elliott  ESP

Car Subwoofer Driver -  22W into 4 Ohm power amplifier; Variable Low Pass Frequency: 70150Hz __ Contact: Flavio Dellepiane, fladello @ tin.it

Circuit Combines Power Supply & Audio Amplifier -  20-Dec-01 EDN-Design Ideas The circuit in Figure 1 can help if you must transfer dc power and audio over a pair of copper wires.  One application for such a circuit is a low-cost door-opening system with speech input.  The circuit uses only one IC, the well-known LM317, a low-cost power-supply regulator.  Using this chip, you can modulate the adjustment-pin input with the audio signal from an electret condenser microph__ Circuit Design by Susanne Nell, Breitenfurt, Austria

Class A2 SE 812A Amp -  This Amp is a variation on the SE 826 amp, below.  It uses positive grid bias derived directly from the cathode follower driver stage.  The 6F8-G driver/input tube was chosen because it biases to the required voltage (+14V) for the output stage's bias.  (Note that the 6F8-G can be replaced with a 6SN7.  I just happen to like the looks of the 6F8-G better) __ Designed by Bob Danielok

Class A2 SE 812A Amp power supply -  This is the power supply for a Class A2 812A Amp __ Designed by Bob Danielok

Class A2 SE 826 Amp -  The schematic for the SE 826 amp.  This Amp was an attempt to create a nice Class A2 power amp, similar to the SE 833 amps, described below, but without a 10:1 step-down transformer.  Instead, it uses a choke-loaded cathode follower to drive the output tube.  It uses positive grid bias derived directly from the cathode follower driver stage.  The 6F8-G driver/input tube was chosen because it biases to the required voltage (+14V) for the output stage's bias.  (Note that the 6F8-G can be replaced with a 6SN7.  I just happen to like the looks of the 6F8-G better) __ Designed by Bob Danielok

Class A2 SE 833 Stereo Amp -  The schematic for the SE 833A amp is shown HERE. __ Designed by Bob Danielok

Class A2 SE 833 Stereo Amp Power Supply -  The schematic for its power supply is shown HERE. __ Designed by Bob Danielok

Class A2 SE SV572-160 Stereo Amp -  This amp uses a 6BM8 drive stage similar to the big 833A amp below, except it utilizes CATHODE drive.  I presently have this amplifier set up so i can adjust the grid bias from about +2V to +30V.  There is also a switch that connects the output tube grids to ground (0 Bias) instead of the grid bias supply.  This way i can experiment with various output tubes, including 811A, 812A, SV572-10, SV572-30, SV811-10, etc.  So far, i think the SV572-160 sounds best in this amp.  I think it is because of the cathode drive (also called grounded grid) topology.  I think i like the medium mu transmiting tubes, like 812A, 826, SV572-30 in grid drive amplifiers better.  But in this amp, the 572-160 can be "dialed in" to a nice sweet-spot that sounds great! __ Designed by Bob Danielok

Class A2 SE826 power supply -  The schematic for the power supply __ Designed by Bob Danielok

Class D Audio Power Amplifiers -  01/04/01 EDN-Design Ideas Class D amplifiers are much more efficient than other Classical amplifiers, but their high efficiency comes at the expense of increased noise and distortion.  You can assess the frequencyand Time-domain characteristics of a Class D amplifier, including the output filter, using online simulations__ Circuit Design by Duncan McDonald, Transim Technology Corp

Class T Digital Audio Amplifier Evaluation Board -  This App Note describes a digital amplifier, which operates from13.5-Volt power source and outputs up to20W poor channel power.  The App Note is in PDF format.  Uses a Digital Power Processing Technology EB TA2020 from Tripath Technology

Class-A Power Amplifier using MJE2955, TIP2955 or TIP36 for output stage -  A single-ended Class-A amplifier is essentially one where there is only one active driven output device.  The passive "load" may be a resistor, an inductor   (or transformer) oras in this amplifiera current sink.  Of the three basic options, the current sink offers the highest linearity for the lowest cost, so is the ideal choice.  Some esoteric   (some might say idiosyncratic) designs use inductors or 1:1 transformers, but these are bulky and very expensive.  Unless made to the utmost standards of construction, they will invariably have a negative effect on the sound quality, since the losses are frequency dependent and non-linear. __ Designed by Rod Elliott  ESP

Combine Power Supply & Audio Amplifier -  12/20/01  EDN-Design Ideas The circuit in Figure 1 can help if you must transfer dc power and audio over a pair of copper wires.  One application for such a circuit is a low-cost door-opening system with speech input.  The circuit uses only one IC, the well-kn__ Circuit Design by Susanne Nell, Breitenfurt, Austria

Constant Current Battery Charger -  A simple method of charging a battery from a higher voltage battery is shown in the circuit below to the left.  Only one resistor is needed to set the desired charging current and is calculated by dividing the difference in battery voltages by the charge current.  So, for example if 4 high capacity (4000 mA hour) ni-cads are to be charged at 300 mA from a 12 volt battery, the resistor need, __ Designed by Bill Bowden

Convertible Single Ended SV572-30/3 Stereo Amp -  This project makes use of at least two of the new SV572 series audio power triodes from Svetlana.  This series includes the SV572-3 , SV572-10 , SV572-30 , and SV572-160.  The circuit topology is easily re-configurable ("convertible") to use either the -30 (in Class A2Zero Bias operation) or -3 (in Class A1 operation).  In addition, the -30 can be configured for two different drive schemes (standard grid driven configuration or Cathode Driven.  A set of switches are used to reconfigure (with power off).  But for clarity, the schematics are re-drawn for each mode as shown below __ Designed by Bob Danielak

Crest Audio LT Series LT100 LT1500 & Lt2000 SchematIC Set -  A commercial Class D Amplifier, complete schematics in PDF format

Current Feedback Amp -  The amplifier shown here was previously incorrectly referred to as 'El-Cheapo'.  Thanks to a reader who had a copy of the original 1964 article, it was immediately obvious that my recollection was flawed in the extreme. __ Designed by Rod Elliott  ESP

Darling & DC Darling SE 1626 Amps -  This has become a very popular set of amp designs.  They are all based upon the 1626 Triode output tube and the philosophy to keep things SIMPLE.  I am continually amazed how good these amps sound for what they are.  The name "Darling" came from a good friend's description of my original design.  It looked like a miniature version of "full-sized" SE 300B.  The name stuck  Click  HERE  to find out more __ Designed by Bob Danielak

Darling SE Tube Amplifier -  I started this project with the idea to build a simple single-ended tube amplifier.  I didn't have any experience with the construction of tube amps so I was looking for a beginner's project.  Such a project should be simple (for easy debugging) and it should also be cheap.  Nobody likes to blow up a component of 300 dollars by a small lapse of attention __ Designed by Aren van Waarde

DC Coupled Phono Preamp -  Schematic, Only     Using 6SL7 instead, and DC-coupling of the two stages.  RIAA Preamp based upon the classic RCA 12AX7 design. __ Designed by Bob Danielak

Death of Zen DoZa New Class a Power Amp -  An ultra simple, high performance Class-A power amp.  Revision-A boards now shipping __ Designed by Rod Elliott  ESP

Design an Ultra-Low-Noise S-Band Amplifier -  06/04/12  EDN-Design Ideas Use capacitive reactance to save energy while holding a solenoid in the energized position.   Solenoid loads generally exhibit large hysteresis.  Application of the rated voltage actuates these loads.  Once they are in position, however, you can use a significantly lower voltage to thereafter reliably hold them on.  A lower sustaining voltage results in less heat production and higher efficiency.__ Circuit Design by Jessica MacNeil

Digital Analog Demodulation Project (DADP, VE7DXW) -  The MDSR research station is now operational and will be active on 20m operating in QRP.  The MDSR test station was able to log a QSO with the ARRL W1AW call using 25W of power __ Designed by Guy Roels ON6MU

Direct Injection Box for Recording & Psystems -  An essential companion for the mixer for stage or recording work __ Designed by Rod Elliott  ESP

DIY 50W Amplifier based on ICL8063 -  This is a handy, easy to build general purpose 50 watt amp.  The amp has an input for a radio, TV, stereo or other line level device.  It also has a phono input for a record player, guitar, microphone. __ Designed by Aaron Cake

DRM converter used in a Yaesu FRG-100  -  This is a very sensitive homemade MF converter/interface allowing you to receive the DRM radio (Digital Radio Mondiale) with your general coverage receiver and a soundcard.  It can also be used for software radio apllications, and other MF to LF experiments (not just DRM, and surely not just for the Yaesu FRG-100) !
I've tested this project on a allmode Yaesu FRG-100 receiver.  Within certain limits you can change the output bandwidth frequency to suit your needs.  The converter is very stable, low noise, sensitive and low on power consumption. __ Designed by Guy Roels ON6MU

Dual Phantom Power Pre-Amp -  Schematic only, no circuit description __ Designed by John Simonton

Dynakit Mark E 40 Watt Power Amplifier -  Vintage schematic

ECM Mic Preamplifier -  A microphone amplifier that may be used with either Electret Condenser Microphone (ECM) inserts or dynamic inserts, made with discrete components. __ Designed by Andy Collison

El-Cheapo -  This is the real El-Cheapo, presented in more or less original form.    A Really Simple Power Amplifier. __ Designed by Rod Elliott  ESP


Audio Power Amplifiers:   #'s - A       B - E      F - L      M - R      S - Z


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